auxv: require the target to be tracable (or yourself)
same as for environ, except that we didn't do any checks to
prevent access after suid execve
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/proc/base.c b/fs/proc/base.c
index fc471b8..e94b58b 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -281,9 +281,9 @@
static int proc_pid_auxv(struct task_struct *task, char *buffer)
{
- int res = 0;
- struct mm_struct *mm = get_task_mm(task);
- if (mm) {
+ struct mm_struct *mm = mm_for_maps(task);
+ int res = PTR_ERR(mm);
+ if (mm && !IS_ERR(mm)) {
unsigned int nwords = 0;
do {
nwords += 2;